fix(docs): fix grammar and remove duplicate words in documentation and source#4335

0x8F3A7C1D wants to merge 3 commits intogoogle:maingoogle/adk-python:mainfrom

0x8F3A7C1D:fix-typos-and-docs0x8F3A7C1D/adk-python:fix-typos-and-docsCopy head branch name to clipboard